Woodstove & Fireplace Air Supply Ventilator

  • passive air supply ventilator side view
  • Close-up of air supply ventilator's filter
  • Close-up of innter grill and filters positioned behind it.
  • Photo of disassembled air supply ventilator
  • Graphic labeling air supply ventilator parts.

If your house is a typical tightly-built modern home, you need an Air Supply Ventilator (ASV). Whether you have a kitchen fan, bathroom fan, dryer vent, fireplace, or woodstove, your home would benefit from installing one or more ASVs.

Today’s architects, contractors, and intelligent homeowners realize that proper ventilation is a necessary component for personal health and a healthy home. By bringing fresh filtered make-up air into your house from outside, ASV ensures your fireplace or woodstove operates efficiently, with no smoke leakage.

Inquiries from building and HVAC contractors, email Karen.

Graphic of the air flow from outdoors and into a home through the air supply ventilator (ASV)

Outside-In: How the ASV brings fresh air into your home

ASV is made of tough ABS polymer. Outside air enters ventilator through a louvered grill, which provides protection from rain. Insects and vermin are excluded by a separate screen located directly behind grill.

Air flows into your house through a tube inside ASV. Can be cut to fit any wall thickness up to 14 inches. Manually-operated damper controls airflow, with settings for any volume flow ranging from fully closed to fully open. If desired, you can dictate a constant minimum airflow by popping out an optional plug built into damper.

Standard filter comes with every ASV. Captures dust, and is removable for cleaning. Can be washed as often as you like. Also helps block outside noise, and allows maximum airflow. Filters ordinary dust particles exceeding 10 microns. If you suffer from asthma or seasonal allergies, optional filters are available that capture pollens and other very fine particulates before entering your home (see below).

ASV comes complete with hardware and caulking for installation.

ASV price order
ASV-90
shipping weight 5 lbs		 $99

You may also select an optional upgraded filter that best serves your needs:

Special pollen filter

Filters out 90% of air pollutants over 5 microns in size. Unique design promotes longer filter life, even with heavy soiling.  Reduces airflow through ventilator– damper must be wide open when in use. Not washable.

High-tech filter
Filters out extremely small particles, ½-micron size and up: viruses, bacteria, asbestos particles, skin and hair particles, and unburned hydrocarbons from gasoline and diesel exhausts. Internal fibers are electrically charged to act as a magnet. Reduces airflow through ventilator – damper must be wide open when in use. Requires replacement at frequent intervals. Not washable.

filter price order
ASV special pollen filter
shipping weight 1 lb		 $7.95
ASV high-tec filter
shipping weight 1 lb		 $15.95

For other special needs, consider these optional ASV components:

Storm shield: Provides added protection in high wind areas.


Cover plates: To cover larger wall openings.

accessory price order
ASV storm shield
shipping weight 1 lb		 $45
ASV cover plates: 6.5 inches
shipping weight 1 lb		 $12 Call to special order